XI PHENOMENA OF ORGANIC NATURE 365 
_ ciples of inductive and deductive philosophy dur- 
_ ing the same period. Probably there is not one 
_ here who has not in the course of the day had 
_ occasion to set in motion a complex train of reason- 
ing, of the very same kind, though differing of 
_ course in degree, as that which a scientific man 
goes through in tracing the causes of natural 
_ phenomena. 
_ A very trivial circumstance will serve to ex- 
-emplify this. Suppose you go into a fruiterer’s 
shop, wanting an apple,—you take up one, and, 
on biting it, you find it is sour; you look at it, 
and see that it is hard and green. You take 
up another one, and that too is hard, green, 
and sour. The shopman offers you a third; 
but, before biting it, you examine it, and find 
that it is hard and green, and you immediately 
‘say that you will not have it, as it must 
sour, like those that you have already 
_ tried. 
Sea can be more simple than that, you 
_ been done by the hid 5 you will be greatly sur- 
prised. In the first place, you have performed 
- the operation of induction. You found that, in 
‘two experiences, hardness and greenness in apples 
_ went together with sourness. It was so in the 
first case, and it was confirmed by the second. 
ule, it is a very small basis, but still it is enough 
